|Table of Contents|

Research on dynamic amplification factor of highway simply supported girder bridge based on modal superposition method(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2023年06期
Page:
146-155
Research Field:
道路与铁道工程
Publishing date:
2023-12-30

Info

Title:
Research on dynamic amplification factor of highway simply supported girder bridge based on modal superposition method
Author(s):
ZHOU Yong-jun1;  XUE Yu-xin1;  GAO Xu-jun2;  LI Ran-ran3;  WANG Ye-lu1;  ZHAO Yu1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Northwest Engineering Corporation Limited, Xi'an 710065, Shaanxi, China; 3. Jinan City Construction Group Co., Ltd., Jinan 250014, Shandong, China)
Keywords:
bridge engineering;  simply supported girder bridge;  dynamic amplification factor;  modal superposition;  modal truncation order
PACS:
U441.3
DOI:
10.19818/j.cnki.1671-1637.2023.06.008
Abstract:
To explore the effect of modal orders on analyzing dynamic amplification factors(DAFs)of deflection and bending moment, simply supported T-girder bridges, box girder bridges, and hollow slab bridges with standard spans were selected as the research objects, and based on the modal superposition method, the DAF formula of simply supported girders under the action of three-axle vehicle was derived. The vehicle-bridge coupling vibration analysis program was compiled by using MATLAB software for numerical calculation, and the relationship of the DAFs of the deflection and bending moment with the order of modal truncation was studied under the influence of three factors, such as deck roughness, vehicle speed, and vehicle mass. In addition, the ratio relationship between two DAFs under different modal orders was analyzed and verified by the dynamic field test of a 30 m simply-supported box girder bridge. Research results show that the DAF of deflection is less affected by the modal order, and the contribution rate of the first-order mode to the DAF of deflection is 99%. When the modes at the first five orders are selected, the complete structural response information of the bridge can be obtained. However, the DAF of bending moment is greatly affected by the modal order, and the contribution rate of the first-order mode to the DAF of bending moment is 86%, while the contribution rate of the modes at the first five orders is 90%. Reliable results of DAF of bending moment are obtained when the modes at the first 25 orders or more are considered. The contribution rate of modal orders to the DAFs is affected by vehicle speed to some extent. The influences of deck roughness and vehicle mass on the convergence of the DAFs are not significant. The DAF of bending moment is less than that of deflection. When the first-order mode is selected, the ratio of the two is 0.86. When the modes at the first 15 orders are selected, the ratio of the two is 0.95. It is suggested to use the DAF of deflection under the same test condition. 2 tabs, 10 figs, 29 refs.

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Last Update: 2023-12-30